<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            height:21.2202vw;
            width: 21.2202vw;
        }
        .father1{
            border-radius: 50%;
            background: conic-gradient(red,yellow,lime,aqua,blue,fuchsia,red);
        }
        .father2{
            margin-top: 10px;
            background:repeating-conic-gradient(#bbb 0,#bbb 25%,#eee 0,#333 50%);
            background-size: 30px 30px;
        }
    </style>
</head>
<body>
    <div class="father1"></div>
    <div class="father2"></div>
</body>
</html>